全文获取类型
收费全文 | 2645篇 |
免费 | 101篇 |
国内免费 | 192篇 |
专业分类
化学 | 7篇 |
力学 | 74篇 |
综合类 | 39篇 |
数学 | 2578篇 |
物理学 | 240篇 |
出版年
2023年 | 27篇 |
2022年 | 13篇 |
2021年 | 39篇 |
2020年 | 27篇 |
2019年 | 55篇 |
2018年 | 49篇 |
2017年 | 60篇 |
2016年 | 44篇 |
2015年 | 47篇 |
2014年 | 81篇 |
2013年 | 201篇 |
2012年 | 86篇 |
2011年 | 96篇 |
2010年 | 85篇 |
2009年 | 143篇 |
2008年 | 190篇 |
2007年 | 181篇 |
2006年 | 140篇 |
2005年 | 130篇 |
2004年 | 102篇 |
2003年 | 113篇 |
2002年 | 135篇 |
2001年 | 86篇 |
2000年 | 104篇 |
1999年 | 75篇 |
1998年 | 77篇 |
1997年 | 79篇 |
1996年 | 53篇 |
1995年 | 57篇 |
1994年 | 34篇 |
1993年 | 31篇 |
1992年 | 30篇 |
1991年 | 22篇 |
1990年 | 28篇 |
1989年 | 17篇 |
1988年 | 20篇 |
1987年 | 20篇 |
1986年 | 14篇 |
1985年 | 19篇 |
1984年 | 17篇 |
1983年 | 7篇 |
1982年 | 21篇 |
1981年 | 16篇 |
1980年 | 10篇 |
1979年 | 14篇 |
1978年 | 9篇 |
1977年 | 15篇 |
1976年 | 8篇 |
1975年 | 3篇 |
1974年 | 3篇 |
排序方式: 共有2938条查询结果,搜索用时 281 毫秒
991.
Zhi‐Hua Zhang Hari M. Srivastava 《Mathematical Methods in the Applied Sciences》2019,42(18):6459-6474
This paper provides some characteristic properties of the weighted particular Schur polynomial mean of several variables. In addition, an elementary proof of an important inequality involving the weighted particular Schur polynomial mean is given. Various related results involving a family of the Schur polynomials, symmetric polynomials, and other associated polynomials, together with the potential for their applications, are also considered. 相似文献
992.
Tomasz Klimsiak 《Stochastic Processes and their Applications》2019,129(4):1259-1286
We prove the existence of weak solution for a system of quasi-variational inequalities related to a switching problem with dynamic driven by operator associated with a semi-Dirichlet form and with measure data. We give a stochastic representation of solutions in terms of solutions of a system of reflected BSDEs with oblique reflection. As a by-product, we prove the existence of an optimal strategy in the switching problem and show regularity of the payoff function. 相似文献
993.
The problem of H∞ robust control based on event‐triggered sampling for a class of singular hybrid systems with Markovian jump is considered in this paper. The primary object of this paper here is to design the event‐triggered sampling controller for a class of uncertain singular Markovian systems, and two fundamental issues on mean square exponential admissibility and H∞ robust performance are fully addressed. By making use of a suitable Lyapunov functional, in combination with both infinitesimal operator and linear matrices inequalities(LMIs), the sufficient criteria are derived to guarantee the controlled singular hybrid system with Markovian jump is robustly exponentially mean‐square admissible and has a prescribed H∞ performance γ. Finally, a typical RLC circuit system is given to show the effectiveness of the proposed control method. 相似文献
994.
本文将时齐马氏过程中重要的代数不等式Liggett-Stroock不等式推广到非时齐马氏过程中,建立了非时齐马氏过程的转移半群与Liggett-Stroock不等式之间的关系. 相似文献
995.
朱立 《数学年刊A辑(中文版)》2019,40(4):365-376
令■设λ_1,λ_2,λ_3是不全同号的非零实数,且满足λ_1/λ_2为无理数,则对于任意实数η和ε 0,不等式■有无穷多组素数解p_1,p_2,p_3.该结果改进了Gambini,Languasco和Zaccagnini的结果. 相似文献
996.
997.
A. Yu. Chebotarev 《Journal of Applied Mechanics and Technical Physics》2003,44(6):852-857
A mathematical model of a steady viscous incompressible fluid flow in a channel with exit conditions different from the Dirichlet conditions is considered. A variational inequality is derived for the formulated subdifferential boundary-value problem, and the structure of the set of its solutions is studied. For two-ption on the low Reynolds number is proved. In the three-dimensional case, a class of constraints on the tangential component of velocity at the exit, which guarantees solvability of the variational inequality, is found. 相似文献
998.
The upper bounds for the variance of a function g of a random variable X obtained in Cacoullos (1982) (for short CP) are improved in the case μ = E(X) ≠ 0. A main feature of these bounds is that they involve the second moment of the derivative or the difference of g. A multivariate extension for functions of independent random variables is also given. 相似文献
999.
1000.
P. H. Sach D. S. Kim L. A. Tuan G. M. Lee 《Journal of Optimization Theory and Applications》2008,136(1):105-123
In this paper, we introduce new dual problems of generalized vector variational inequality problems with set-valued maps and
we discuss a link between the solution sets of the primal and dual problems. The notion of solutions in each of these problems
is introduced via the concepts of efficiency, weak efficiency or Benson proper efficiency in vector optimization. We provide
also examples showing that some earlier duality results for vector variational inequality may not be true.
This work was supported by the Brain Korea 21 Project in 2006. 相似文献